Method of and apparatus for filtering viscous material



July l', 1930. H. PREM-ICEA 1,769,388

METHOD oF AND- APPARATUS FOR FILTERING' vIscOvUS MATERIAL Filed May 2. 1928 y 2 Shexa'ns--Shelecl l Patented July 1, 1930 HUGH rnnnrrron, `or` PITTSBURGH, rnnnsirnvmarn METHOD or` Nn APPARATS non Frtxrnnms viscous MATERIAL- i Appueation mea May '2,

My invention consists of an improvement in iilters for viscous material for the purpose of eliminating impurities therefrom by 'use of the mechanism in carrying out the' method involved herein.

The invention is kparticularly adapted to the'manufacture of varnish andsimilar'material or substance derivedfrom natural deposits, as lgums and the like, for use in the arts. In the particular art ofvarnish-making, the'gums or resins' forming, the raw ma ferial or base are procured to a large extent from natural sources and often contain or embody considerable earthy or other' insoluble l5 foreign matter. While such impurities may be removed from the finished product when inl liquid form, considerable `difficulty is usually.

D l e more fully hereinafter described.

ln the drawings4 illustrating certain. preferred embodiments ofv means for practicing the invention: i y

Fig. l is avertical sectional view vofanap'- paratus for carrying normal position for operation;

Fig. 2 is a plan View of Fig. l;

Fig. 3 is av vertical sectional view similar to Fig. 1,'showing the central supply .well lowered; n

Fig. 4 is a horizontal sectional view on the linel V-IV of Fig. l.

In the drawings, 2 is an outer enclosing outlet Hue 26, is a filtering'vessel 5., Said vessel .may be either cylindrical, square, orV

of other suitable form,resting upon the top out the invention, in'

i928; "sensi Np. 274,665.-

E(S PTErr @NICE-Eil] ofwall 2 by upper terminalflange 6 or other- I wise, and provided top 7 L Centrallyarranged within the `vessel `Sis e the supply f well or conduit f8 extending* with a closing cover or 'through the 'top 7 closed at the topy and open at the betteln, the openlower en d termina-tinga short distance above the bottom 9 ofthe vessel, and freely communicating with'k the therein. p

In the;drawings, I

show a pluralityof temper screws l2 extending downwardly through y lugs 13 ofthe conduit 8 and engaging the top 7 By,adjustment of the temper screws the conduit maybe elevated to the position shown in Fig. 1',or lowered to .the position shown y positiomas f desired. lTheupper end of conduit 8 is proin Figi, or to any Vintermediate vided with an air press'ure pipefld for thev purpose Of ,supplying .compressed air tothe interior and its contents.

Extending transversely: across the vessel 5 I atA differentlevels are a.. seriesof grids' or perforated plates 15, each support imposed rmass of filtering medium' 16',l of any1 L ing la supersuitable material, as cracked stone or the like, through which the material to betreatedwill pass Vrupwardly in its progress. i The 'filtering material is preferably of varyingcoarseness,

whereby to'cumulatively act on the upwardly flowing current of material to be filtered, in its progress toward a lateral overflow outlet gutterorchannel 17, `leading o fronrtheupper portion of the vessel fordelivery into a receiving receptacle 18 for "filtered material.

The-cover 7 is provided with an opening and closing holel) throughwhich any suitable solvent or wash for the iilteringmedium may be introduced, thus permitting vthe tering medium to be used successively for a considerable time without renewal. `The bottom of the vessel 5 is provided withia clean-outdoor through which: matter eliminated and yprecipita removed from time to time.

any foreign ted may be will be seen that the material to be treated,

as raw varnish gum, resin, or the like, in a melted condition, may be introduced at the top of the central conduit 8 by removal of the cover 11, after which the cover is then tightly replaced. After sufhcient time and subjection to the generated heat, with result- Ving melting of the gum, it willrise upwardly from chamber 10 through the grids and the serial sections of filtering mediums 16, to the level of the contents of the conduit 8.

Thereafter, sufficient heat treatment having been maintained, upon application of air pressure by pipe lll to the interior of the conduit 8, the column of material in the conduit will be forced downwardly therein Vand gradually upwardly through the filtering mediums. Any foreign material carriedin suspension will be collected and separated, the refined liquid passing finally out through conduit 17 into the tank 18. As the operation proceeds, the conduit 8 may be gradually lowered until its bottom is closely adjacent to the bottom 9 of vessel 5 as in Fig. 8, so that the final remaining contents of the conduit will be forced laterally from its bottom in a Vthin film. Due to the air pressure in conduit 8 the material being treated will rise upwardly through the mediums 16 for final discharge, effecting a practically completeV circulation of the entire mass, with accompany- Also, that any other heating medium may be utilized, and that the number of the grids 15, 'the filtering material mediums 16v and supporting grids provided with filtering niaterial, a central supply conduit leading to the bottom of the casing, means for lowering the conduit towards the casing bottom, and means for supplying fluid pressure to the upper portion of the conduit.

2. In a filtering apparatus for viscous material, a casing having a series of transverse supporting grids provided withk filtering material, a central supply conduit leading to the bottom of the casing 'and having a closing top, means for supplying fluid pressure to theupper portion of the conduit, and means for varying the vertical position of the conduit. v Y v 3. In a filteringapparatus for viscous material, a casing having a series of transverse supporting grids provided with filtering material, a central supply conduit leading to the bottom of the casing, means for lowering the conduit towards the casing bottom, means for supplying fluid pressure to the upper portion of the conduit, an outer enclosing casing, and .means for heating the casing and its contents. Y

il.k In combination with an outer enclosing wall, a filtering Vcasing therein having a series of transverse supporting Vgrids and a lower open area, a central vertically movable supply conduit having a removable top and an air pressure'supply', a lowermost burner within the base portion of the wall, and an overflow spout leading off from the casing through the wall.

5. In combination with an outer enclosing wall, a filtering casing therein having a seriesof tranverse supporting grids and a lower open area, a coil of heating pipe arranged below one or more of the grids, filtering niaterial supported on the grids, a central vertically movable supply conduit havinga removable Vtop and an air pressure supply, a lowermost burner within the base portion of the wall, and an overflow spout leading olf from the casing through the wall.

In testimony whereof I hereunto affix my signature.

HUGH PRENTICE.

number of itsunits, and various other features'ofthe apparatus, as well as its dimensions, design, or other details, may be variously changed or modified by the skilled mechanic in applying the invention, but that all such changes are to be considered as within the scope of the following claims.

What I claim is: i

1. In a filtering apparatus for viscous material, a casing having a series of transverse 

